Brake-shoe mechanism.



Patented Apr. 22, |902.I

H. TESSEYMAN. BRAKE SHUE MEGHANISM.

(Application led Jan 27, 1902 (No Model.)

NiTED STATES PATENT OEEICE.

HENRY TESSEYMAN, OF DAYTON, OI-IIO, ASSIGNOR TO THE BARNEY da SMITH CARCOMPANY, OF DAYTON, OHIO.

BRAKE-SHoEMEcHANIsn/l.

SPECIFICATION forming part of Letters Patent No. 698,421, dated .April22, 1902. AApplication filed January 2'7, 1902. Serial No. 91,371 (Nomodel.)

To a/ZZ whom, t may concern:

Be it known that I, HENRY TEssEYMAN, a citizen of the United States, anda resident of the city of Daytonfin the county of Montgomery and Stateof Ohio, have invented a new and useful Improvement in Brake-ShoeMechanism; and I do hereby declare that the following is a full, clear,and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to improvements in the construction of thebrake-shoes and to the manner of supporting the same on the truck ofrailway-cars or other vehicles. Heretofore it has been customary tomount the brake-head to the brake-hanger at or near the center of theformer by means of a pivotal connection between the two, the shoe beingattached to the brake-head and oscillating therewith independent of thebrake-hanger, the result of such arrangement being greater wear of theshoe at one end than at the other-as, for example, in Figure 2 the arrowindicates the travel of the wheel as being from left to right, while inFig. 3 the arrow indicates the travel of the wheel to be in the oppositedirection, and in both cases where the brake-head is pivotally connectedto the brake-hanger the lower end of the shoe will wear faster than theupper end, while when the wheels travel in opposite directions fromthose indicated in the drawings the upper end ofthe shoe will wearfaster than the lower end, the reason for which is the tendency of thewheel to draw one end of the shoe closer and harder against the wheel,according to the direction in which the wheel is revolving, and toobviate this objection various devices have been employed, none of whichhave successfully or satisfactorily accomplished their purpose.

This invention contemplates a simple and efficient manner of hanging thebrake-shoe, together with the peculiar construction of the shoe, wherebythe objection above mentioned is overcome and whereby when the shoe isworn out the remnant will be substantially uniform in thickness and thewaste therebyreduced to a minimum. i

It consists, rst, in rigidly attaching the brake-head, which carries thebrake-shoe, to the brake-hanger, and, second, in forming the said shoeof differential thickness through out its length to compensate for thedier ence between the arcs in which its opposite ends travel in itsmovement toward the cena ter of the wheel.

- In the drawings, Fig. l `representsa perspective view of a portion ofa brake-hanger support with my improvement suspended therefrom; Fig. 2,a vertical section through the center` of Fig. l, and in which is alsoshown a portion of a car-wheel, the brakeshoe being hung on the insideof and applied to the wheel, its normal position when out of servicebeing shown by dotted lines, the arrow indicating the direction of thetravel of the wheel; Fig. 3, a side elevation showing the brake-shoehung on the outside of and applied to the wheel, the dotted line Xrepresenting the brake-shoe as about worn out and the arrow indicatingthe direction of the travel of the wheel; and Figs. 4c and 5 representperspective detached views of the brake-head and brake-shoe,respectively.

Similar letters of reference indicate corresponding parts in the severalfigures of the drawings.

Arepresents a support, `which `may form a part of the truck, or it maybe aseparate support attached thereto, and to this support is suspendeda brake-hanger B, preferably in the form of a yoke, j ournaled in aboxC, secured to the said support by any suitable means-such, for instance,as a Ubo1t D and nuts E. The free ends of the hanger B are by preferenceiiattened, as shown, and perforated at a, and between the said flattenedportions of the said hanger is located a brakehead F, having bolt-holesb, which register with the perforations ot, the brake-head being rigidlysecured to the hanger B by means of bolts c, which pass through'theperforations c1, and holes b and are secured therein by nuts d. Thus thebrake-hanger and the brake-head are made to swin g in the boX O as asingle structure.

The brake-head is provided with projecting ears e, perforated at f toreceive a brake-lever Gin the usual manner and with which all personsskilled in the art to which myinvention relates are familiar.

H represents the brake-shoe, the same being provided with a lng g,having a key passage-way 7L therethrough and being adapted to enter arecess 1'., formed in the brake-head, and by which the brake-shoe issecured to the brake-head by means of a key I, which is driven throughthe passage-ways j of the brake-head and h of the brake-shoe in thecustomary manner and as clearly illustrated in the drawings.

The face of the brake-shoe is curved to conform to the periphery of thewheel J, the shoe being formed thicker at one end than at the other forthe purpose and in the manner already described and as clearly shown inthe drawings.

It will be observed that when the brakeshoe is out of service it hangsclear of the wheel, that it can be operated to engage the same by anyofthe ordinary brake-levermechanisms, that its movement is in thedirection of an arc of a circle, and that its upper and lower endstravel in different arcs, according to the length of the shoe and itsrelative distance from the pivotal line of the hangerjournal, and it isto be understood that the difference of travel of the two ends of theshoe is compensated for by the differential thickness of the samerelative to the wearing distance in which it moves.

Having thus fully described my invention, I claiml. The combination witha wheel, of a brake-shoe adapted to engage the periphery thereof andbeing of differential thickness throughout its length to compensate forthe difference between the arcs in which its opposite ends travel,abrake-head carrying the brake-shoe, an oscillating brake-hanger towhich the brake-head is rigidly secured and a support for thebrake-hanger.

2. The combination with a Wheel, of a brake-hanger, a brake-head rigidlysecured thereto, a bearing for the brake-hanger and in which the same isrotatably mounted, a suitable support for said bearing, a brakeshoecarried by the brake-head and being of differential thickness throughoutitsv length to compensate for the dierence between the aros in which itsopposite ends travel in its movement toward the center of the Wheel, andmeans for applying the brake-shoe to the Wheel.

In testimony whereof I hereunto subscribe my name this 25th day ofJanuary, 1902.

HENRY TESSEYMAN.

IVitnesses:

C. C. ROGERS, H. R. ROCHESTER:

